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r = √(x²+y²)
dan
tanα = y/x
diket koordinat kart (4,4), jadi
r = √(4²+4²) = √32 = 4√2
dan
tanα = y/x = 4/4 = 1
maka αα = 45 derajat.
jadi koordinat kutubnya = (4√2 , 45 derjat)